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IttookthepolicetwoyearstofinallyascertainwhatexactlyhappendonthenightofthemurderIttookthepolicetwoyears这是什么语法?tofinallyascertain为什么中间加个副词?

题目详情
It took the police two years to finally ascertain what exactly happend on the night of the murder
It took the police two years 这是什么语法?
to finally ascertain 为什么 中间加个副词?
▼优质解答
答案和解析
it take sb.to do sth固定搭配 花费某人多长时间做某事
副词是用来修饰ascertain这个动词的